The Net (2016)

Namchulwoo is a poor fisherman living a simple but happy life with his wife and daughter on the north side of a river that divide s the two Korea's. Every day he goes fishing on the river, where the check point soldiers know him well and trust him not to cross the invisible border in the water.

but one day his fishing net gets caught in the boat engine, and Nam cannot stop him self from drifting into the south.